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Modulating electron population pathways for time-dependent dynamic multicolor displays.

Weixin Xu¹, Lei Lei¹, Yubin Wang¹

¹Institute of Optoelectronic Materials and Devices, Key Laboratory of Rare Earth Optoelectronic Materials and Devices of Zhejiang Province, College of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, P. R. China. leilei@cjlu.edu.cn.

Materials Horizons

|November 1, 2021

Summary

This study introduces multicolor luminescent nanoparticles (NPs) with integrated afterglow and upconversion (UC) properties. These nanoparticles achieve dynamic color changes from green to red using a single activator, offering new possibilities for advanced displays.

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Area of Science:

Materials Science
Nanotechnology
Luminescence

Background:

Multicolor luminescent nanoparticles (NPs) have emerging applications.
Controlling luminescence color often requires modulating multiple parameters.
Integrating different luminescence mechanisms in a single material is challenging.

Purpose of the Study:

To develop a novel route for multicolor luminescent NPs by integrating afterglow and upconversion (UC) from a single activator.
To achieve dynamic color variations without altering external parameters.
To explore the electronic fine structures of lanthanide activators.

Main Methods:

Synthesis of Na3HfF7:Yb/Er nanoparticles (NPs).
Characterization of luminescence properties under X-ray irradiation and 980 nm laser excitation.
Analysis of electron population pathways and emission profiles.

Main Results:

Er3+ ions in Na3HfF7:Yb/Er NPs exhibit green afterglow (X-ray) and red UC (980 nm laser).
Dynamic color change from green to red is achieved by illuminating pre-X-ray-irradiated NPs with a laser.
Fine emission profiles of Er3+, Ho3+, and Tm3+ were observed under X-ray irradiation.

Conclusions:

A new approach for time-dependent dynamic color displays using single-activator integrated afterglow and UC NPs.
A simple method for revealing electronic fine structures of lanthanide activators at room temperature.
Demonstrated potential of these NPs for advanced optical applications.